[linux-dvb] Strange: fileds of interlaced movie in wrong order in vdr/vob file

[Ralph Metzler <rjkm@convergence.de>]

Uwe Freese writes:
 > - -recorded a TV production (series, talk show,...) that is
 >  "interlaced"
 > 
 > - -converted with "mplex -t DVD ..." into a vob file (mplex from
 >  mpegtools that comes with the DVB drivers package)
 > 
 > - -in the resulting video I have the video fields in this order:
 > 
 >  b2t1 b3t2 b4t3 ...
 > 
 >  with bx a bottom field and tx a top field
 > 
 > That means that the one field (the bottom lines) is one picture too
 > early for every whole picture. That results is a disturbed playback.
 > When I change the order to b1t1 b2t2 ... (as it should be) with some
 > VirtualDub filters, it's all correct.
 > 
 > (I used some Win tools for viewing the single fields, but they should
 > work fine like they do with all progressive movie material. Because
 > of
 > this, they shouldn't be the reason for the error.)
 > 
 > 
 > Now the great question:
 > 
 > Which program causes this wrong output?
 > 
 > I think it's either VDR or mplex.
 > 
 > When I view the "interlaced" TV-productions with VDR, the playback is
 > all ok, but that doesn't mean that VDR stores the fields in the
 > right way. It could also mean that it only does the same wrong thing
 > when loading the video for replaying in reverse order.
 > 
 > An important question for me is if VDR makes a difference between
 > interlaced and progressive material when storing it in vdr files and
 > if mplex makes this difference.
 > 
 > I hope some of you programmers know what code can lead to this error
 > and which couldn't be the troublemaker.
 > 
 > 
 > 
 > I'm using VDR 0.72 with drivers 0.8.2.


None of the programs or drivers can cause what you describe.
They only change the packaging of the elementary streams not the
streams themselves. 


Ralph


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